Analysis of the ν1 and ν2 + ν4 bands of 12CH4 |
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| Authors: | Linda R Brown Robert A Toth Alan G Robiette Jens-Erik Lolck Robert H Hunt James W Brault |
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| Institution: | Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109 USA;Department of Chemistry, University of Reading, Reading RG6 2AD, England;Department of Chemistry, Aarhus University, DK-8000 Aarhus C, Denmark;Department of Physics, The Florida State University, Tallahassee, Florida 32306 USA;Kitt Peak National Observatory, 950 N. Cherry Street, Tucson, Arizona 85726 USA |
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| Abstract: | Line assignments, positions, strengths, and experimentally determined upper states are reported for the ν1 and ν2 + ν4 infrared bands of 12CH4. The bands have been analyzed using infrared spectra recorded with different optical densities and temperatures at 0.02- and 0.01-cm?1 resolution using a four-passed grating spectrometer at Florida State University and a Fourier transform spectrometer at Kitt Peak National Observatory. Both ν1 and ν2 + ν4 lines are assigned through J′ = 14. For J′ ≥ 10, the upper state of the vibrationally infrared inactive ν1 band interacts strongly with ν2 + ν4 and is observed in the infrared spectrum with line strengths on the order of 10?3 cm?2 atm?1. The upper-state energies and transition intensities are calculated from the molecular constants and transition moment matrix elements obtained through a simultaneous analysis of ν1, ν3, ν2 + ν4, 2ν4, and 2ν2. |
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